Sanding machine



April 27, 1965 M. E. SCHULER SANDING MACHINE 5 Sheets-Sheet 1 OriginalFiled Sept. 18, 1959 //V VE N701?- April 27, 1965 M. E. SCHULER SANDINGMACHINE Original Filed Sept. 18, 1959 5 Sheets-Sheet 2 mm w, m L U H V vv m. E z w w 0 R a u a a d M 6 April 27, 1965 M. E. SCHULER 3,130,051

SANDING MACHINE Original Filed Sept. 18, 1959 v 5 Sheeis-Sheet 3 i w Imam/rag. Mam/c: 5 ft/Ill! ER M. E. SCHULER 3,1 80,061

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April 27, 1965 M. E. SCHULER SANDING MACHINE 5 Sheets-Sheet 5 OriginalFiled Sept. 18, 1959 nvmwm.

mic: E. Scam ER United States Patent 3,186,061 SANDING MACI'mJE MauriceE. Schiller, Evansville, Ind., assignor, by mesne assignments, to TheUnion Tool Corporation, Warsaw, Ind, a corporation of IndianaContinuation of application Ser. No. 840,948, Sept. 18, 1959. Thisapplication Apr. 11, 1963, Ser. No. 273,262 9 Claims. (Cl. l-137) Thepresent invention relates to a sanding machine, and more particularly toa sanding machine which is highly effective for use on stock having anirregularlyshaped outward configuration, the instant application being acontinuation of now abandoned patent application Serial No. 840,948,filed September 18, 1959, for Sanding Machine.

Heretofore, the most satisfactory sanding of molding and/ or othermaterial having irregular surfaces has been by a tedious hand operation.Although there have been machines designed for such a purpose, thesehave proven mostly objectionable because of the difficulty of adjustment thereof to secure an effectively sanded finished product. Forexample, these aforementioned prior machines were not satisfactory inview of the fact that the abrasive belt used for the sanding operationnecessarily had to be turned from the generally horizontal plane inwhich it was traveling, and sometimes at very sharp angles, to engageall of the surface to be sanded. Accordingly, such prior stucturesactually effected on y the accurate sanding of a particular portion ofthe surface of the irregularly-shaped stock. In ardition, the prior typesanding machines made no provision in the sanding carriage assembliesthereof for accommodating any changes in position of the major sandingforce on the work being sanded insofar as lateral displacement wasconcerned, i.e. movement laterally to the normal path of travel of theabrasive sanding belt.

By virtue of the instant invention, the applicant has provided a new andimproved sanding machine for molding and the like which is highlyeffective on stock having virtually any form of irregular outer surface.The sanding machine promotes elfective sanding through structure wherebythe stock is rotatable preferably at a pivot point disposed above amedial horizontal plane through the stock being sanded, with referenceto a generally horizontally disposed abrasive belt. The latter structureaffords positive and direct sanding of the irregular surface of themolding Without the necessity of bending or folding the abrasive beltout of its normal horizontally disposed traveling position.

In addition, the applicant has provided a new and novel sanding carriageincluding adjustable means for varying the pressure of the abrasive belton the work being sanded, with a particular adjustment being providedfor moving or adjusting the sanding block forming a part of the sandingcarriage assembly in lateral directions with reference to the path oftravel of the abrasive belt to permit the application of the mostefiiective sanding force to the surface of the molding being sanded. Thelatter feature, together with the novel arrangement of componentsforming the instant sanding carriage assembly, provides for effectiveadjustment and affords a highly satisfactory sanding operation on stockwith practically any type of irregular surface configuration.

Accordingly, the principal object of the present invention is to providea sanding machine which permits highly eifective sanding of molding orlike material having virtually any type of irregularly-shaped surfaceconfiguration.

Another object of the present invention is to provide a new and novelsanding machine whereby the work-supporting member thereof is rotatablewith reference to the abrasive sanding belt.

A further object of the present invention is to provide a novel sandingcarriage assembly for a sanding machine, the components of which may beadjusted in one of several ways to effect an optimum sanding force onthe work being sanded.

A still further and more general object of the present invention is toprovide a new and novel sanding machine which is capable of variousadjustments to permit the effective sanding of a wide range ofirregularly-shaped pieces of stock, each of which in a simple yet highlyeffective manner.

Other objects and a better understanding of the inven\ tion will becomemore apparent from the following description, taken in conjunction withthe accompanying drawings, wherein FIG. 1 is a view in front elevation,partially fragmentary, showing a portion of the over-all sanding machineforming the instant invention, with the work-supporting member thereofbeing tilted from a horizontal plane;

FIG. 2 is a view in front elevation showing another portion of thesanding machine of FIG. 1, Where FIGS. 1 and 2, when combined, disclosethe over-all machine;

FIG. 3 is an enlarged view in side elevation, partially fragmentary,showing the novel sanding carriage assembly forming a part of theinstant invention;

FIG. 4 is a plan view of a sanding carriage assembly of FIG. 3;

FIG. 5 is an enlarged detailed view of the sanding block-supportingstructure forming a part of the sanding carriage assembly of FIGS. 3 and4;

FIG. 6 is a View in endelevation of the sanding blocksupportingstructure of FIG. 5;

FIG. 7 is a plan view of the sanding block-supporting structure of FIG.6;

FIG. 8 is a view in end elevation of the assembly for rotating thework-supporting member of the instant novel sanding machine, takengenerally at line 8-8 of FIG. 2 and looking in the direction of thearrows, but with the Work being shown in a horizontal position;

FIG. 9 is a view similar to that of FIG. 8, but showing thework-supporting member, and the work thereon, in a rotated position;

FIG. 10 is a view in end elevation, generally corresponding to thestructure of FIG. 8, showing particular details thereof;

FIG. 11 is a detailed view of one of the members forming a part of therotatable work-supporting assembly of FIGS. 8 and 9;

FIG. 12 is a detailed view in front elevation of the work-supportingassembly of FIG. 11;

FIG. 13 is a fragmentary plan View of the work-supporting assembly ofFIGS. 11 and 12;

FIG. 14 is a fragmentary and isolated view of the mechanism used foradjusting the Work-feeding mechanism in a generally up-and-down andforward-and-back- Ward direction, taken generally at line 14-14 of FIG.2. and looking in the direction of the arrows, but with the over-allmechanism in an untilted position;

FIG. 15 is a view in end elevation of .the structure of FIG. 14, showingfurther details thereof;

FIG. 16 is a plan view of the structure of FIGS. 14 and 15, showingstill further details thereof; and,

FIG.- 17 is a detailed View in front elevation of the support memberforming a part of the mechanism of FIGS. 14, 15 and 16.

For the purposes of promoting an understanding of the principles of theinventions, reference will now be made to the embodiments illustrated inthe drawings and specific language will be used to describe the same. Itwill nevertheless be understood that no limitation of the scope of theinventions is thereby intended, such alterations and furthermodifications in the illustrated device, and such further applicationsof the principlesof the inventions as illustrated therein beingcontemplated as would normally. occur to one skilled in the art to whichthe inventions relate.

Referring now'to FIGS. land 2, the applicants novel sanding machinecomprises a base assembly 11, the specific structural details of whichare not shown, but which include legs and other supporting frameworkhaving a sheet metal covering 11a therearound, and on the top of whichis anupper frame member 1112 (see FIGS. 8 and 9). The sanding machinealso includes as a part thereof a belt-type feeding mechanism 12, abelt-type contact mechanism 14, adjustment mechanism 15 for rotating awork-supporting member 50 on structure disposed on the upper framemember 11b of the machine, adjustment mechanism 16 for varying therelative position of the feeding mechanism 12 with reference to thework-supporting member 50, an abrasive belt assembly 18 positioning anabrasive belt 18a of the type commonly used in the Woodworking industry,a sanding carriage assembly, and a finished work table 20.

Briefly, and as a matter of orientation, sanding is accomplished byplacing the stock to be sanded, such as wood molding, for example, onthe belt-type feeding mechanism 12, the belt thereof feeding the stocktowards the belt-type contact mechanism 14 and the body of the sandingmachine, where it moves upon the work-supporting member 50 thereof. Thework-pieces are then urged along the work-supporting member 50 and underthe sanding carriage assembly 19, which sanding carriage assembly 19 hasa portion thereof urging the abrasive belt 18a onto the work-pieces toeffect the sanding action. The work-pieces then move from the sandingmachine onto the finished'work table 20 disposed at the opposite end ofthe machine from the feeding mechanism 12. It should be understood that,all the preceding components are to be V fects upward and downwarddisplacementof the sleeve 26 with reference to the top surface of thesanding machine, and hence upward and downward movement of the sandingcarriage assembly 19.

A threaded shaft 29 extends from the sleeve 27 through a frame assembly30 comprising side members 30a having a back member 3% in removableengagement therewith (see FIGS. 3 and 4). A control member 3 1 has oneend thereof threadedly secured to the shaft 29, with its other endpivotally fastening to an elongated connecting member 32. at 32a, thelatter forming a part of a clutch-like arrangement (not fully shown) forselectively positioning the sanding block in or out of engagement withthe abrasive belt of the abrasive belt assembly 1 8, to be discussedherebelow.

An operating wheel 33 connects to the free end of the threaded shaft 29adjacent a frame member 34 which discussed herebelow, but that theover-all operational sequence stated above is merely to indicate thevarious stages involved during the representativesanding of the work.

Considering now the structure and operation of the sanding carriageassembly 19 forming a part of the instant invention, and as particularlydisclosed in FIGS. 1 and 3 to 7, inclusive, a vertical support member25, extending upwardly from the framework of the machine, has a movablesleeve 26 thereon, to which sleeve 26 another sleeve 27 is secured, asby Welding, for example, the latter sleeve 27 serving as a bearing areafor the remaining components of the sanding carriage assembly 19. Thevertical support member 25 has a plate 251: affixed to the top surfacethereof, as by a nut and bolt means 25b, for example, and through whicha handle 28a connects to the upper end of a threaded shaft 23 whichextends downwardly to and is positioned on the framework of the sandingmachine. Inasmuch as the sleeve 26 has an extension 26a through whichthe threaded shaft 2% passes, movement of the handle 28:: and thethreaded shaft 23 cfextends from the control member 31, and serves topermit selective lateral movement of the frame assembly 30 and hence thesanding block 45 across the abrasive belt. In the latter regard, itshould be noted that the frame assembly 30 is positioned on the threadedshaft 29 through nut members 35 which are in releasable engagement withthe side members 3ila thereof. An extension member 3110 is secured tothe back member 3% of the frame assembly 35) for receiving one or moreweights (not shown) used to vary and counterbalance the applicationforce of the sanding block 45 to the work.

The opposite end of the frame assembly 30 has plates 36 and 37 extendingbetween the side members 30a thereof, with a support arm 38 beingdisposed between the aforementioned plates 36 and 3'7 and pivotable at38a. The range of pivoting movement of the support arm 38 may becontrolled by screws 39 which extend through the side members 30a of theframe assembly 3:).

The support arm 38 forms a part of the sanding block support structurewhich comprises a universal type joint 40 centrally disposedtherebeneath near the free end thereof, which universal joint 4hsupports a plate member 41 having elongated openings 41a therein forreceiving bolts 42 which extend into another plate member 44 threadedlysecured to'the top surface of the sanding block 45. Also extendingdownwardly through the support :arm 38 are spring-urged leveling members'46, which are conventional in form, and which serve to distributepressure, as desired, onto the top surface of the plate member 41.

Extending upwardly from the plate member 44 is an arm 44a, from which athreaded bolt 44b extends into an ear 41b disposed upwardly from theplate member 41. It should :be understood that when the bolts 42 arereleased for movement in elongated openings 41a, and when the bolt 44bis rotated, the plate member 44, and hence the sanding block 45, may bemoved with reference to the plate member 41. When the desired positionis assumed, the bolts 42 are tightened to secure the over-all assembly.

, "The above structure, and particularly the adjustment provided by thethreaded bolt 44b, is important when defining the major sanding pressureor force on the work being sanded, which major pressure should becentered on the work. Althoughthe leveling members 46 are importantinsofar as independent pressure adjustment is concerned, use of thelatter do not laterally move the major sanding pressure centrally ontothe work, but instead vary the pressure, as desired, on particulardetails of the molding being sanded.

With reference now to the adjustment mechanism 15 for rotating thework-supporting member 50, as particularly disclosed in FIGS. 8 to 13,inclusive, the upper frame member 1111 of the sanding machine is adaptedto receive members 51 which are preferably spaced equidistantly apartfrom each other (see FIGS. 1 and 2).

Elements 52, which are rotatably received in the members 51, each have acutout portion approximating the upper section thereof, which cutoutportion receives the worksupporting member 50 which is typically securedthereto by means of flush-type screws 50a, for example. It should beapparent, therefore, that the positioning of the screws 50a also serveto retain the elements 52 in the desired spaced-apart relationship.

Disposed between the respective elements 52 are fences 54, each of whichhave several vertically extending elongated slots 54:: therein forreceiving bolts 54b which extend into openings disposed in a sidesurface of the work-supporting member 50. By loosening the bolts 54b,each of the fences 54 may be raised or lowered, depending upon theparticular configuration of the molding being sanded by the machine. Theabove-discussed portion of the rotating assembly for the work-supportingmember 50 is completed by the use of deflector-type members 55, which,in a preferred embodiment of the invention, are made from spring steel,for example, each positioned on an arm 55:: secured to the under surfaceof the worksupporting member 50 through a vertical support 55b. All ofthe preceding structural relationship should be particularly apparentfrom FIGS. 11, 12 and 13.

With reference now to FIGS. 8, 9 and 10, the element 52 disposedadjacent the feeding mechanism 12 has a plate member 60 secured thereto,as by common flushtype screws 66a, for example, which plate 60 serves asa support for the feeding mechanism 12, and the associated componentstherefor, so that upon rotation of plate 60, as discussed herebelow, thework-supporting member 5i) rotates, as well as the latter mechanism. Inaddition, in view of the relation of the contact mechanism 14 to thefeeding mechanism 12 (see FIG. 2), the former is also rotatable withplate 60.

The particular rotation of the plate 60 is accomplished by means ofstructure comprising a downwardly extending control arm 69b, integralwith or fixedly secured to the plate 60, having a universal joint 61rotatably mounted thereon into which a threaded shaft 62 is received.Extending outwardly and downwardly from the upper frame member 11b is asupport member 110 (see FIGS. 9 and which also has a universal joint 64rotatably secured thereto, the latter receiving the other end of thethreaded shaft 62. Inasmuch as the support member 110 is fixedly securedto the framework of the sanding machine, the rotation of the threadedshaft 62 effects movement of the plate 60 through downwardly extendingcontrol arm 60b and universal joint 61 from a position where thework-supporting member 50 on the element 52 is in a generally horizontalplane (see FIG. 8) to a position where the latter is at an acute anglewith reference to the horizontal plane (see FIG. 9). In a typicalembodiment of the invention, the range of rotation can be approximately45, for example.

It should be particularly understood from the above that by providingstructure for rotating the work with respect to the abrasive beltforming a part of the abrasive belt assembly 18, direct face-to-faceengagement can be made between the abrasive belt and the particularirregular surface of the work being sanded by means of the sanding block45, without the necessity of bending or otherwise folding the abrasivebelt. Thus, highly effective sanding action is secured, as Well asmaximum utilization of the abrasive surface of the belt. In addition,and most importantly, the desired sanding action also results by reasonof the structural relationship whereby the rotation is effected at apivot axis at or above a medial horizontal plane through the Work,therefore requiring a minimum rotational displacement to effect the fineadjustment necessary to accommodate any configuration on the surface ofthe work being sanded.

With reference now to the adjustment mechanism 16 for theforward-and-backward and upward-and-downward movement of the feedingmechanism 12, as particularly indicated by FIGS. 14, 15, 16 and 17, theplate 60, referred to hereabove in connection with the worksupportingmember rotating mechanism, is secured to a plate a, as by welding, forexample, which, together with members 7012 and 700 define a channel-Way70 (see FIGS. 8, 10, 14 and 15). A support member 80 has a portion 80athereof received in the channel-way 70, with an intermediate portion 39bof the support member 80 connecting to a downwardly extending portion800 thereof, the latter relationship being particularly evident withreference to FIG. 17. It should be further apparent from FIGS. 14, 15and 16 that the feeding mechanism 12 is secured to the presentlydescribed adjustment mechanism 16 through bracket assembly 90 secured toa plate member 750, the latter to be discussed further herebelow.

F orWard-and-backward movement of the feeding mechanism 12 isaccomplished by means of a rotatable shaft 72 which extends through aface plate 73 disposed at one end of the channel-way 70, the other endof the rotatable shaft 72 extending into a sleeve-like element 80dsecured to a surface of portion 890 of support member 80 (see FIG. 14).It should be understood then that when shaft 72 is rotated, the portion80a of support member 89 is moved in a forward or backward direction inchannelway 70 through action on portions 80b and 80c thereof. With thelatter movement, plate member 75c also moves, thereby permitting theforward-and-backward movement of the feeding mechanism 12.

Upward-and-downward movement of the feeding mechanism 12 is accomplishedthrough another channelway 75 defined by members 75a and 75b and theaforementioned plate member 750. Channel-way 75 is adapted to receivethe portion 800 of the support member (see FIG. 16). Member 75c has anear 75d extending threadedly therefrom through which a rotatable shaft77 is threadedly received, with portion 800 of support member 80 alsohaving an ear 80:2 thereon threadedly engaging the shaft 77. Inasmuch asthe feeding mechanism 12 extends from member 75c, when it is desired toeither raise or lower the latter, the threaded shaft 77 is rotated sothat the channel-way 75 moves with reference to the portion 800 of thesupport member 30.

Thus, from the preceding it should be apparent that the instant sandingmachine provides novel structure whereby the feeding mechanism 12 may beadjusted forward-andbackward and upward-and-downward with reference tothe work-supporting member 50, such action being readily effectedthrough the utilization of a novel support member 80. In addition, andas also discussed hereabove, the applicant has provided a noveladjustment mechanism whereby the work being sanded may be rotated withreference to the abrasive sanding belt disposed thereabove, with suchrotational displacement of the work providing direct faceto-facepressure on the portion of the work being sanded, optimum utilization ofthe abrasive belt, and a sensitive adjustment feature, the latter beingparticularly important with respect to the defined pivot axis of therotatable element on which the work-supporting member 50 is disposed.

In regard to the over-all mechanism forming the instant sanding machine,it might be briefly noted that the abrasive belt 13a is disposed arounda driven pulley 18b and an idler pulley 18c, all forming a part of theabrasive belt assembly 18 and all of which are well-known in the H art.In addition, provision may be made in the machine,

although not described herein, for raising or lowering the general pathof travel of the abrasive belt, as well as for moving a portion of theframe of the machine in a forward-and-backward direction, as desired.Other components included as a part of an operative sanding machineforming the instant invention is the conventional power source fordriving the feeding mechanism 12 and the contact mechanism 14 which, inthe preferred embodiment of the invention, are interconnected withuniversal type joints (not shown), or other means, so that therespective belts forming a part of each operate at an equal and auniform rate of travel.

It should be evident from the above that the applicants sanding machineis highly versatile insofar as adjustment features thereof areconcerned. The sanding machine is readily used when the Work is beingfed onto the worksupporting member 50 by releasing the clutch to dropthe sanding carriage assembly 19, and particularly the sanding block 45,into contact with the abrasive belt, the abrasive surface of which isthen urged into contact with the work through a complementaryconfiguration disposed on the face of the sanding block 45 correspondingto the desired pattern of the molding or like material being fed throughthe machine. The sanding block 45 may be carefully adjusted through thenovel structure disclosed hereabove so that it is centered over the workbeing sanded to permit the optimum sanding pressure thereon and, hence,effective sanding action.

If desired, weights may be affixed to the member 30c as acounterbalancing measure where a light pressure is required on workbeing finished. Moreover, although more particularly disclosedhereabove, the deflectors 55, as well as the movable fences 54, found inconnection with the work-supporting member 50 and the elements 52 onwhich the latter is disposed, are readily adjustable, the formerserving'to urge the work'being sanded into a defined path of travel,while the latter providing versatility insofar as various-shaped stockis concerned. Moreover, it should be understood that the applicantsnovel sanding machine is susceptible to various changes within thespirit of the invention, and, thus the above description should beconsidered illustrative and not as limiting the scope of the followingclaims.

I claim:

1. A sanding machine comprising a framework, an endless abrasive belthaving a reach mounted on said framework, mounting means to movablyposition a work-supporting member on said framework below said endlessabrasive belt and parallel with said reach, said mounting meansincluding a first element having an arcuate surface mounted on saidframework, and a second element mounting said work-supporting memberreceived on said arcuate surface of said first elementand rotatable withrespect to said framework, said arcuate surface having a generatrixwhich lies parallel with said reach of said endless abrasive belt, theaxis of said generatrix being fixedly disposed along a path beginning atthe work-engaging surface of said work-supporting member and extendingtowards the plane of said endless abrasive belt, and means rotating saidsecond element of said mounting means.

2. A sanding machine comprising a framework, an endless abrasive belthaving a reach mounted on said framework, mounting means to movablyposition a work-supporting member on said framework below said endlessabrasive belt and parallel with said reach, said mounting meansincluding a first element having an arcuate surface mounted on saidframework, and a second element mounting said work-supporting memberreceived on said arcuate surface of said first element and rotatable 8porting member received on said arcuate surface and rotatable withrespect to said framework, said arcuate surface having a generatrixwhich lies parallel with said reach of said endless abrasive belt, theaxis of said genate surface mounted on said framework, and a secondelement positioning said work-supporting surface received on saidarcuate surface and rotatable with respect to said framework, saidarcuate surface having a generatrix which lies parallel with said reachof said endless abrasive belt, the axis ofsaid generatrix beingvertically disposed at least at the plane of the work-engaging surfaceof said work-supporting member, feeding mechanism introducing work ontosaid work-supporting member, contact mechanism controlling flow of saidwork onto said work-supporting member, means rotating said feedingmechanism longitudinally of said reach of said endless abrasive belt,means rotating said contact mechanism longitudinallyof reach of saidendless abrasive belt, and means rotating said second element of saidmounting means.

5. The sanding machine of claim 4 where said feeding mechanism and saidcontact mechanisms rotate simultaneously and in equal increments.

6. A sanding machine comprising .a framework, an endless abrasive belthaving a reach mounted on said framework, mounting means to movablyposition a-worksupporting member on said framework below said endlessabrasive belt and longitudinally of said reach, said mounting meansincluding a first element having an arcuate surface disposed on saidframework, and a second element mounting said work-supportingmemberreceived on said arcuate surface and rotatablewith respect to saidframework, said arcuate surface having a generatrix which lies parallelwith said reach of said endless abrasive belt, the axis of saidgeneratrix being vertically disposed at least at the level of saidwork-supporting member, and means rotating said second element of saidmounting means.

7. In a sanding carriage assembly having an abrasive member forming apart thereof, a sanding block supporting structure comprising a supportbracket, a first plate member universally mounted from said supportbracket, a second plate member selectively secured to said first platemember in sliding relationship, .a sanding block secured to said secondplate member, resilient pressure members disposed on said bracketbalancing said first with respect to said framework, said arcuatesurface having a genetratrix which lies parallel with said reach of saidendless abrasive belt, the axis of said generatrix being disposed abovethe vertical level of said work-supporting member, and means rotatingsaid second element of said mounting means.

3. A sanding machine comprising a framework, an endless abrasive belthaving a reach mounted .on said framework, mounting means to movablyposition a work-supporting member on said framework below said endlessabrasive belt and longitudinally of said reach, said mounting meansincluding a first element having an arcuate surface, and a secondelement mounting said work-supplate member with reference to saidbracket, and control means interconnecting said first and said secondplate members slidably adjusting said second plate member and saidsanding block with reference to said first plate memher.

8. A sanding machine comprising a framework, an endless abrasive belthaving a reach mounted on said framework, mounting means to movablyposition a worksupporting member on said framework below said endlessabrasive belt and longitudinally of said reach, said mounting meansincluding a first element having an arcuate surface mounted on saidframework, a second element positioning said work-supporting memberreceived on said arcuate surface and rotatable with respect to saidframework, said arcuate surface having a generatrix which lies parallelwith said reach of said endless abrasive belt, the axis of saidgeneratrix being vertically disposed at least at the level of saidwork-supporting member, means rotating said second element of saidmounting means, a feeding mechanism introducing work onto said 224,002work-supporting member, and mechanism adjustably po- 5 592,992 sitioningsaid feeding mechanism with reference to said 9,191 Work-supportingmember in a plane normal to the path 1,059,055 of movement to saidendless abrasive belt. 1,063,923

9. The sanding machine of claim 8 where said feeding 2,678,522

mechanism is rotatable with said second element of said 10 2,922,258mounting means.

Doane 51-2155 Lowry et a1 51-139 Yarnell 51-141 Lindquist 51-135 Lucas51-141 Philibosian et al. 51-139 Bass et al. 51-55 LESTER M. SWINGLE,Primary Examiner.

3. A SANDING MACHINE COMPRISING A FRAMWORK, AN ENDLESS ABRASSIVE BELTHAVING A REACH MOUNTED ON SAID FRAMEWORK, MOUNTING MEANS TO MOVABLYPOSITION A WORK-SUPPORTION MEMBER ON SAID FRAMEWORK BELOW SAID ENDLESSABRASIVE BELT AND LONGITUDINALLY OF SAID REACH, SAID MOUNTING MEANSINCLUDING A FIRST ELEMENT HAIVNG AN ARCUATE SURFACE, AND A SECONDELEMENT MOUNTING SAID WORK-SUPPORTING MEMBER RECEIVED ON SAID ARCUATESURFACE AND ROTATABLE WITH RESPECT TO SAID FRAMEWORK, SAID ARCUATESURFACE HAVING A GENERATRIX WHICH LIES PARALLEL WITH SAID REACH OF SAIDENDLESS ABRASSIVE BELT, THE AXIS OF SAID GENERATRIX BEING DISPOSEDINTERMEDIATE THE WORK-ENGAGING SURFACE OF SAID WORK-SUPPORTING MEMBERAND SAID ABRASIVE BELT, FEEDING MECHANISM INTRODUCING WORK ONTO SAIDWORK-SUPPORTING MEMBER, MEANS ROTATING SAID FEEDING MECHANISMLONGITUDINALLY OF SAID REACH OF SAID ENDLESS ABRASIVE BELT, AND MEANSROTATING SAID SECOND ELEMENT OF SAID MOUNTING MEANS.